In daily activities, children will be interested in telephone poles and beverage cans. Cylinder is a common three-dimensional geometric figure, which children often come into contact with in daily life, but their understanding of cylinder is vague, and they are often called rods. Therefore, on the basis that the children in the big class have known all kinds of plane geometry. I conducted a teaching activity about understanding cylinders.

Second, the activity objectives

1, through operation, compare the characteristics of the cylinder (like cylinder, circle, straight, size and upper and lower circular surfaces).

2, provide a variety of operating materials, so that children can actually operate, and use language to express the operating results, develop children's ability of observation, comparison and judgment, and deepen children's understanding of cylinders.

3. Cultivate children's interest in actively participating in activities.

Third, activity preparation

Disposable cups wool ribbon plasticine pencil white paper, etc.

Four. Process activity

(A) the organization of teaching

1, Teacher: (shows the jar and the cup) Do they look the same? I'm going to roll them on the ground and push them gently with my hands. What is their rolling track?

2. The child tries to find the track.

There are two things under your chair that are similar in shape to those in Teacher Zhang's hand. Please take it out and roll it on the ground like a teacher and see what your rolling track is like.

3. Summary: One rolls straight forward and the other rolls in circles. (and draw the directions of two kinds of tracks on the blackboard)

(2) Introduce the concept of "cylinder" and perceive the specific characteristics of cylinder in operation.

1, please find out the difference between the two objects: please put the one rolling in a straight line on the left table and the one rolling in circles on the right table. Please take a closer look. Why do things here keep rolling forward? And the other side is rolling around? Are there any differences between them?

2. Children's conclusion: A round face of the cup is big and a round face is small, while the two round faces of the jar are the same size.

3. Through measurement, the specific characteristics of the cylinder are introduced: What makes you say that the upper and lower circular surfaces of the jar are the same size? I just brought a rope today. Let me measure it. (Teacher's measurement) You are great. You are absolutely right. The round surface of the cup is one big and one small, and the round surface of the jar is the same size. Why don't I go to the place where the children roll straight forward and randomly choose one to test it and see if the result is still the same. (The teacher talks to the children while demonstrating)

4. In mathematics, this round and straight shape, like a column, is called a cylinder, with the upper round surface as big as the lower round surface.

5. Judge cylinder and non-cylinder.

1) Show the trap: Is this a cylinder? Why?

2) Show an object as big as a round surface with a concave center: Is this a cylinder? Why?

6. Provide children with materials to find cylinders among many objects:

1) There is a lot of information on the teacher's desk. I provided wool, ribbons, plasticine, paper and pens. Please measure in your own way, find out the cylindrical object and put it in the laundry list.

2) Teachers conduct sampling inspection in each group. Summary: Who measured this? What material did you measure it with? What is the result of the measurement? So, it is a cylinder.

(3), homemade cart, and end the activity in the game.

Teacher: Cylinders can also be turned into fun trolleys. Look! I put a rope through it. Pull the cart by hand, and it's done. It followed us as soon as the rope was pulled. Oh, here we go again!

Verb (short for verb) reflection

Mathematics is a very logical subject, but it happens all the time around us: a leaf, five good friends, billboards on the roadside are square, and many children's pencils are cylindrical ... Since they are so close to us, why can't children take the initiative to discover and explore the mysteries that can be solved by themselves? Therefore, I designed the activity of "Understanding Cylinders".

Children often come into contact with cylinders in daily life, but cylinders are common three-dimensional geometric figures, and children's consciousness is vague, so it is difficult to connect with society. By comparing the common cups and jars in life, children can find the particularity in the free expansion of play, so as to understand the specific characteristics of the cylinder. Therefore, children will be more interested. Due to various objective reasons, the children in our class are very different. Children with strong ability have good language expression ability, complete answers to questions and good observation. However, children with weaker abilities are very different. Therefore, this situation should be taken into account when designing activities. In the activity, I adopted the method of fostering strengths and avoiding weaknesses, and the children with strong ability acted together with the children with relatively poor ability to guide them to learn from each other. My activity is also to cultivate children's observation ability, so that children can judge the shape characteristics of cylinders through observation and comparison, and learn to perceive various cylinders with various senses. Finally, the children ended their activities in a happy "cart-pulling" game. The new "Outline" proposes to create a relaxed environment so that every child can participate in practical exploration activities and feel the joy of exploration and discovery. After the guidance of experts and continuous trial teaching and revision. I feel happy in this teaching activity.

As the saying goes: the authorities are fascinated, and the onlookers are clear. Teachers need to devote themselves to their work when leading classes, so it is difficult to have time to jump out and think. Observation gives us an opportunity to understand our working environment and even ourselves more objectively and calmly. As a learner today, I feel very lucky to have such an opportunity. Fortunately, there are so many famous teachers and allied sisters who give me directions. I hope you can give us more valuable advice. thank you